A digital computer includes an efficient mechanism by which an exception handler can traverse the instruction stream in a reverse direction to identify the instruction which gave rise to the exception condition after a discontinuity in an instruction stream. The digital computer is provided with both...http://www.google.com.hk/patents/US6009515?utm_source=gb-gplus-share專利 US6009515 - Digital data processing system including efficient arrangement to support branching within trap shadows
